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Astron. Astrophys. 331, 147-161 (1998)

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Wind diagnostics and correlations with the near-infrared excess in Herbig Ae/Be stars *

M. Corcoran 1, 2 and T.P. Ray 1

1 Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
2 Service d'Astrophysique, Centre Études de Saclay, F-91101 Gif-sur-Yvette, France

Received 9 April 1996 / Accepted 30 October 1997

Abstract

Intermediate dispersion spectroscopic observations of 37 Herbig Ae/Be stars reveal that the equivalent widths of their [OI] [FORMULA] 6300 and H [FORMULA] emission lines, are related to their near-infrared colours in the same fashion as the T-Tauri stars. Such a correlation strongly supports the idea that the winds from Herbig Ae/Be stars arise in the same manner as those from T-Tauri stars, i.e. through accretion driven mass-loss. We also find that the [OI] [FORMULA] 6300 line luminosity correlates better with excess infrared luminosity than with stellar luminosities, again supporting the idea that Herbig Ae/Be winds are accretion driven. If one includes the lower mass analogues of the Herbig Ae/Be stars with forbidden line emission, i.e. the classical T-Tauri stars, the correlation between mass-loss rate and infrared excess spans 5 orders of magnitude in luminosity and a range of masses from 0.5 [FORMULA] to approximately 10 [FORMULA]. Our observations therefore extend the findings of Cohen et al. (1989) and Cabrit et al. (1990) for low mass young stars and, taken in conjunction with other evidence (Corcoran & Ray 1997), strongly support the presence of circumstellar disks around intermediate mass stars with forbidden line emission. An implication of our findings is that the same outflow model must be applicable to these Herbig Ae/Be stars and the classical T Tauri stars.

Key words: stars: mass-loss – stars: pre-main sequence – stars: circumstellar matter

* Based on observations made at the La Palma Observatory, the Caltech Submillimeter Observatory, and the European Southern Observatory/Max Planck Institute 2.2m Telescope.

Send offprint requests to: Myles Corcoran (corcoran@discovery.saclay.cea.fr)

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© European Southern Observatory (ESO) 1998

Online publication: February 4, 1998
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